1 files changed, 23 insertions, 0 deletions
diff --git a/scripts/analyze-migration.py b/scripts/analyze-migration.py
index fcda11f31d..923f174f1b 100755
--- a/scripts/analyze-migration.py
+++ b/scripts/analyze-migration.py
@@ -417,6 +417,28 @@ class VMSDFieldIntLE(VMSDFieldInt):
         super(VMSDFieldIntLE, self).__init__(desc, file)
         self.dtype = '<i%d' % self.size
 
+class VMSDFieldNull(VMSDFieldGeneric):
+    NULL_PTR_MARKER = b'0'
+
+    def __init__(self, desc, file):
+        super(VMSDFieldNull, self).__init__(desc, file)
+
+    def __repr__(self):
+        # A NULL pointer is encoded in the stream as a '0' to
+        # disambiguate from a mere 0x0 value and avoid consumers
+        # trying to follow the NULL pointer. Displaying '0', 0x30 or
+        # 0x0 when analyzing the JSON debug stream could become
+        # confusing, so use an explicit term instead.
+        return "nullptr"
+
+    def __str__(self):
+        return self.__repr__()
+
+    def read(self):
+        super(VMSDFieldNull, self).read()
+        assert(self.data == self.NULL_PTR_MARKER)
+        return self.data
+
 class VMSDFieldBool(VMSDFieldGeneric):
     def __init__(self, desc, file):
         super(VMSDFieldBool, self).__init__(desc, file)
@@ -558,6 +580,7 @@ vmsd_field_readers = {
     "bitmap" : VMSDFieldGeneric,
     "struct" : VMSDFieldStruct,
     "capability": VMSDFieldCap,
+    "nullptr": VMSDFieldNull,
     "unknown" : VMSDFieldGeneric,
 }